!!! someone finally responded !!!
I'm part of the BimmerAlliance crew in the DC Metro area and we have quite a few meets regularly, however not many Z's are part of the crew.
Mondays - Hardtimes Springfield, VA starting around 8-8:30PM
Thursdays - Fairfax Corner, VA starting around 8-8:30PM
Saturdays - Quite a few options for makes/models of all cars
Bethesda Cars and Coffee
Great Falls Cars and Coffee
Sundays - Fair Lakes, VA Cars and Coffee
I believe we also do monthly meets in rockville, MD. I'll get back to this post with more info on that one.
'04 Z4 3.0i - 3M Satin White Vinyl Wrapped, OE Front/Side Aero, Sound Gen Mod, Muffler Delete, Interior LED, Matte Black Grills, RPI Red Scoop, Dinan CAI, Windblox Screen, gapTech RCH+, CDV Delete, Clutch Stop, AutoSolutions SSK, ZHP Knob, USMillWorks Front Plate, 15&20mm Spacers, TEIN SS Coils, RE Race Brace, RE RSM